Im*plu"vi*um (?), n. [L., fr. impluere to rain into; pref. im- in + pluere to rain.] Arch.
In Roman dwellings, a cistern or tank, set in the atrium or peristyle to recieve the water from the roof, by means of the compluvium; generally made ornamental with flowers and works of art around its birm.
© Webster 1913.